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  • Polymer and Materials Science  (6)
  • 1990-1994  (5)
  • 1985-1989  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    The dependence of enzyme leakage on crosslink density in poly(N-vinyl-2-pyrrolidone) hydrogels with immobilized urease (1993)
    Weinheim : Wiley-Blackwell
    Angewandte Makromolekulare Chemie 207 (1993), S. 101-109 
    Details
    ISSN: 0003-3146
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Description / Table of Contents: Urease wurde in Hydrogelen immobilisiert, die durch Bestrahlen ternärer Mischungen von N-Vinyl-2-pyrrolidon/Wasser/Vernetzer mit y-Strahlen hergestellt wurden. Als Vernetzer wurden Ethylenglycoldimethacrylat und Trimethylolpropan-triacrylat verwendet, wobei Hydrogele mit Unterschieden in Quellungsvermögen und Netzwerkdichte erhalten wurden. Die Aktivität der immobilisierten Urease wurde zeitlich im optimalen Temperatur- und pH-Bereich verfolgt. Während bei Hydrogelen mit einem mittleren Molekulargewicht zwischen den Netzpunkten Mc 〉 2000 die Urease ausgewaschen wird, sind solche mit Mc 〈 2000 über einen längeren Zeitraum aktiv.
    Notes: Urease enzyme was immobilized in hydrogels prepared from vinyl pyrrolidone/water/crosslinking agent ternary mixtures by γ-irradiation of the solutions at room temperature. Two types of crosslinking agents used, namely ethylene glycol dimethacrylate and trimethylol propane triacrylate, yielded hydrogels with different swelling and crosslink density properties. The activity of immobilized urease was measured at the optimum conditions of temperature and pH over a period of time. It has been determined that for hydrogels with average molecular weights between crosslinks, Mc, above 2000, urease leakage is a serious problem. When Mc is around and below this value, immobilized systems showed a long time activity.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/apmc.1993.052070110
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  • 2
    Electronic Resource
    Electronic Resource
    Contribution of associogenic end groups in the radiation crosslinking of extended chain samples of poly(ethylene glycol) (1992)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 30 (1992), S. 2055-2057 
    Details
    ISSN: 0887-624X
    Keywords: end group effect ; end-to-end linking ; radiation crosslinking ; poly(ethylene glycol) ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pola.1992.080300933
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  • 3
    Electronic Resource
    Electronic Resource
    Determination of diffusion coefficient of oxygen into polymers by using electron spin resonance spectroscopy. II. Poly(vinyl acetate) (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 44 (1992), S. 1595-1599 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Electron spin resonance spectroscopy has been used to follow the kinetics of radical decay during postirradiation oxidation of poly(vinyl acetate). The oxygen uptake of γ-irradiated spherical poly(vinyl acetate) has been determined from changes in the intensity of the ESR signal. The diffusion coefficient (D) of oxygen determined by this technique showed an inverse relation with dose. The value of the diffusion coefficient of oxygen obtained in this study, after correcting for dose and size effects is 4.5 × 10-8 cm2/s, and is in very good agreement with the literature value of D = 5.1 × 10-8 cm2/s.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1992.070440912
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  • 4
    Electronic Resource
    Electronic Resource
    ESR studies of molecular motions at the interphase region of a blendlike polymeric material (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 52 (1994), S. 1539-1547 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The molecular motions of spin probes at the interphase region of poly(methyl methacrylate) particles sterically stabilized by polyisobutylene (PIB) were studied by ESR spectroscopy. The correlation times (τ) were measured by using the methods of Freed and Kivelson. Activation energies for different modes of motion were calculated at wide temperature range between -140 and 140°C. Viscosities were estimated in methanol saturated PIB channels in the polymer particles. © 1994 John Wiley & Sons, Inc.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1994.070521102
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  • 5
    Electronic Resource
    Electronic Resource
    Adsorption of bovine serum albumin to acrylamide-itaconic acid hydrogels (1994)
    New York, NY : Wiley-Blackwell
    Polymers for Advanced Technologies 5 (1994), S. 664-668 
    Details
    ISSN: 1042-7147
    Keywords: Hydrogel ; Poly(acrylamide/itaconic acid) ; Sorption ; Bovine serum albumin ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this study, acrylamide-itaconic acid hydrogels containing different amounts of itaconic acid prepared by irradiating with γ radiation are discussed. They have been used in experiments of swelling, diffusion and bovine serum albumin (BSA) adsorption. Maximum and minimum swellings were observed with water (1520%) and BSA (890%), respectively. Diffusion of water, NaCl and BSA within hydrogels were found to be non-Fickian in character. In the experiments of BSA adsorption, type III adsorption was found. The hydrogel prepared with 60 mg itaconic acid and irradiated at 2.00 kGy was found to be the best adsorption system for BSA. The adsorption capacity of acrylamide-itaconic acid hydrogel was found to exceed that of acrylamide hydrogel by more than 80-100%.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pat.1994.220051006
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  • 6
    Electronic Resource
    Electronic Resource
    Determination of diffusion coefficient of oxygen into polymers by using electron spin resonance spectroscopy. I. Poly(methyl methacrylate) (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 37 (1989), S. 2577-2585 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: A simple technique has been proposed for the measurement of the diffusion coefficient of oxygen into polymeric spheres. The technique is based on the scavenging of radicals produced by high energy radiation by oxygen. The diffusion coefficient of oxygen determined for poly(methyl methacrylate) has shown an inverse dependency on the dose received. Diffusion coefficient determined for low doses (D = 3.4 × 10-8 cm2/s) as well as that determined after extrapolation to zero dose (D0 = 3.7 × 10-8 cm2/s) are in excellent agreement with the values reported in the literature.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1989.070370910
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